1. Department of Gastroenterology and Hepatology University Hospitals Leuven Leuven Belgium
2. Division of Gastroenterology Rabin Medical Center Beilinson Hospital Petach Tikwa Israel and Sackler Faculty of Medicine Tel Aviv University Tel Aviv Israel
3. University of Medicine and Pharmacy Gr T Popa Iasi and University Hospital St Spiridon Iasi Romania
4. Department of Gastroenterology and Hepatology Wroclaw Medical University Wroclaw Poland
5. Digestive System Research Unit. University Hospital Vall d'Hebron. Centro de Investigación Biomédica en Red de enfermedades hepáticas y digestivas (CIBERehd) Barcelona Spain
6. Department of Internal Medicine VI: Psychosomatic Medicine and Psychotherapy University Hospital Tübingen Tübingen Germany